Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!bu.edu!att!emory!athena.cs.uga.edu!mcovingt
From: mcovingt@athena.cs.uga.edu (Michael A. Covington)
Newsgroups: sci.electronics
Subject: Re: Oscillators with extra-large frequency ranges
Message-ID: <1991Jan6.030106.17979@athena.cs.uga.edu>
Date: 6 Jan 91 03:01:06 GMT
References: <6560003@hpfcbig.SDE.HP.COM> <44553@mips.mips.COM> <4733@media-lab.MEDIA.MIT.EDU>
Organization: Artificial Intelligence Programs,  University of Georgia, Athens
Lines: 15

In article <4733@media-lab.MEDIA.MIT.EDU> minsky@media-lab.media.mit.edu (Marvin Minsky) writes:
>In article <44553@mips.mips.COM> mark@mips.COM (Mark G. Johnson) writes:
>>   >> For a certain project, I would need an oscillator with digital,
>>   >> LOGARITHMIC adjusting (32-bit, 1000 x log) and a HUGE range,
>>   >> 1 kHz to 100 MHz. Is this at all possible?
>
>I just bought a little pocket receiver, the ICOM R1.  It is a triple
>superhet with tuning range from 100Khz to 1300 Mhz, in .5k increments.
>Works fine -- but I don't know what's inside it.

It's almost certainly several different receivers (at least two) in one box.

The usual wide-coverage (0.1-30 MHz) shortwave receiver has a local
oscillator that goes from about 40 to 70 MHz, and a first IF around
40 MHz. This is then down-converted to 455 kHz and demodulated.